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CAS RN: 2950-43-8 | Product Number: H0530

Hydroxylamine-O-sulfonic Acid

Purity: >90.0%(T)
  • HSA
  • HOSA
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Product Number H0530
Purity / Analysis Method >90.0%(T)
Molecular Formula / Molecular Weight H__3NO__4S = 113.09  
Physical State (20 deg.C) Solid
Store Under Inert Gas Store under inert gas
Condition to Avoid Hygroscopic
CAS RN 2950-43-8
Reaxys Registry Number 878303
PubChem Substance ID 87570919
MDL Number


Appearance White to Almost white powder to crystal
Purity(Iodometric Titration) min. 90.0 %
Properties (reference)
Pictogram Pictogram Pictogram
Signal Word Danger
Hazard Statements H302 + H312 + H332 : Harmful if swallowed, in contact with skin or if inhaled.
H314 : Causes severe skin burns and eye damage.
H290 : May be corrosive to metals.
Precautionary Statements P260 : Do not breathe dust or mist.
P280 : Wear protective gloves/ protective clothing/ eye protection/ face protection.
P303 + P361 + P353 : IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water.
P301 + P330 + P331 : IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P304 + P340 + P310 : IF INHALED: Remove person to fresh air and keep comfortable for breathing. Immediately call a POISON CENTER/doctor.
P305 + P351 + P338 + P310 : IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a POISON CENTER/doctor.
Related Laws:
EC Number 220-971-6
RTECS# NC5427000
Transport Information:
UN Number UN3261
Class 8
Packing Group III
HS Number 2825100090
Hydroxylamine for the Transition-Metal-Free Amination Reaction

Experimental procedure:
To the boronic acid (1.0 mmol) in MeCN (5 mL) is added HSA (170 mg, 1.5 eq.), followed by aq. NaOH solution (1 mol/L, 5 mL). The biphasic mixture is stirred for 16 h at room temperature. The reaction mixture is diluted with H2O (30 mL, saturated aq. NH4Cl for products containing acidic functional groups) and extracted with EtOAc (2 × 30 mL). The combined organic extracts are dried (Na2SO4) and concentrated in vacuo. The residue is purified by flash chromatography (EtOAc:hexanes) to afford the amine product.


Synthesis of N-H Aziridines from Unactivated Olefins Using Hydroxylamine-O-Sulfonic Acid


PubMed Literature


Documents (Note: Some products will not have analytical charts available.)
Safety Data Sheet (SDS)
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C of A & Other Certificates
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